The carrier tracking loop, which is for tracking carrier signals transmitted from navigation satellites, can be designed as a Phase-Locked Loop (PLL), an FLL(Frequency-Locked Loop), an FLL-assisted PLL, etc., in the GPS receiver. This paper deals with the comparative performance analysis of the GPS receiver according to the loop filters with various bandwidths in the carrier tracking loops under random vibration environment. When the GPS receiver, which has a second-order FLL, a third-order PLL, or an FLL-assisted PLL with various types of bandwidth of the loop filter, respectively, exposed in the multi-stepwise increasing random vibration from 6 g RMS to 20 g RMS, the various aspects of the signal tracking performance and SNR(Signal to Noise Ratio) as well as the navigation accuracy are analyzed.

Keywords: carrier tracking loop, phase-locked loop, frequency-locked loop, FLL-assisted PLL, vibration